109 lines
3.2 KiB
TypeScript
109 lines
3.2 KiB
TypeScript
import {UIElement} from "../UIElement";
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import {UIEventSource} from "../UIEventSource";
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import {UIInputElement} from "./UIInputElement";
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export class UIRadioButton<T> extends UIInputElement<T> {
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public readonly SelectedElementIndex: UIEventSource<number>
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= new UIEventSource<number>(null);
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private readonly _elements: UIEventSource<UIElement[]>
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private _selectFirstAsDefault: boolean;
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private _valueMapping: (i: number) => T;
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constructor(elements: UIEventSource<UIElement[]>,
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valueMapping: ((i: number) => T),
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selectFirstAsDefault = true) {
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super(elements);
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this._elements = elements;
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this._selectFirstAsDefault = selectFirstAsDefault;
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const self = this;
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this._valueMapping = valueMapping;
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this.SelectedElementIndex.addCallback(() => {
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self.InnerUpdate(undefined);
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})
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}
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GetValue(): UIEventSource<T> {
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return this.SelectedElementIndex.map(this._valueMapping);
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}
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private IdFor(i) {
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return 'radio-' + this.id + '-' + i;
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}
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protected InnerRender(): string {
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let body = "";
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let i = 0;
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for (const el of this._elements.data) {
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const htmlElement =
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'<input type="radio" id="' + this.IdFor(i) + '" name="radiogroup-' + this.id + '">' +
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'<label for="' + this.IdFor(i) + '">' + el.Render() + '</label>' +
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'<br>';
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body += htmlElement;
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i++;
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}
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return "<form id='" + this.id + "-form'>" + body + "</form>";
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}
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InnerUpdate(htmlElement: HTMLElement) {
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const self = this;
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function checkButtons() {
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for (let i = 0; i < self._elements.data.length; i++) {
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const el = document.getElementById(self.IdFor(i));
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// @ts-ignore
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if (el.checked) {
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self.SelectedElementIndex.setData(i);
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}
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}
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}
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const el = document.getElementById(this.id);
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el.addEventListener("change",
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function () {
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checkButtons();
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}
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);
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if (this.SelectedElementIndex.data == null) {
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if (this._selectFirstAsDefault) {
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const el = document.getElementById(this.IdFor(0));
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if (el) {
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// @ts-ignore
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el.checked = true;
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checkButtons();
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}
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}
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} else {
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// We check that what is selected matches the previous rendering
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var checked = -1;
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var expected = this.SelectedElementIndex.data;
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if (expected) {
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for (let i = 0; i < self._elements.data.length; i++) {
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const el = document.getElementById(self.IdFor(i));
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// @ts-ignore
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if (el.checked) {
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checked = i;
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}
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}
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if (expected != checked) {
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const el = document.getElementById(this.IdFor(expected));
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// @ts-ignore
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el.checked = true;
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}
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}
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}
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}
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} |